package reggie.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import reggie.common.R;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j

public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //原始文件名
        String originalFileName = file.getOriginalFilename();
        //使用UUID重新生成文件名，防止文件重复覆盖

        String suffix=originalFileName.substring(originalFileName.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString()+suffix;

        //创建一个目录
        File dir=new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        //输入流,通过输入流读取文件内容
        try {
            FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));
        //输出流，通过输出流将文件显示在浏览器
        ServletOutputStream outputStream= response.getOutputStream();
        response.setContentType("image/jpeg");

        int len=0;
        byte[] buffer=new byte[1024];
        while((len=fileInputStream.read(buffer))!=-1){
            outputStream.write(buffer,0,len);
            outputStream.flush();
        }
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
